CN107747995A - The liquid level gauge filed detection system and method for a kind of high voltage direct current converter valve cooling system - Google Patents
The liquid level gauge filed detection system and method for a kind of high voltage direct current converter valve cooling system Download PDFInfo
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- CN107747995A CN107747995A CN201710984094.4A CN201710984094A CN107747995A CN 107747995 A CN107747995 A CN 107747995A CN 201710984094 A CN201710984094 A CN 201710984094A CN 107747995 A CN107747995 A CN 107747995A
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- 239000007788 liquid Substances 0.000 title claims abstract description 117
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000001816 cooling Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 20
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 34
- 238000012360 testing method Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000004087 circulation Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 238000009825 accumulation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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Abstract
A kind of liquid level gauge filed detection system of high voltage direct current converter valve cooling system, including platform support, transmitter pedestal, ball float pedestal, stepper motor, straight-line displacement mechanism, control module, computer module, straight steel ruler, laser range finder；Described control module is used for the electric signal for controlling stepper motor, the transmitter head on reception transmitter pedestal and laser range finder, described computer module is used for the output signal of processing and control module, and described transmitter pedestal, ball float pedestal, stepper motor, straight-line displacement mechanism are arranged on platform support.Advantage is, described control module is used for the electric signal for controlling stepper motor, the transmitter head on reception transmitter pedestal and laser range finder, described computer module is used for the output signal of processing and control module, and described transmitter pedestal, ball float pedestal, stepper motor, straight-line displacement mechanism are arranged on platform support.
Description
Technical field
The present invention relates to liquid level gauge field of measuring technique, specially a kind of liquid level gauge of high voltage direct current converter valve cooling system
Filed detection system and method.
Background technology
The extension of liquid level gauge application and the renewal of technology, to the calibrating efficiency of calibrating installation, the degree of accuracy and automaticity
Etc. propose higher and higher requirement.At present, each DC converter station valve cooling system has been equipped with various types of liquid level gauges,
The liquid levels such as valve cooling system expansion tank, spray pond are measured, the cold protection system of valve and control system are delivered in measurement signal
The moisturizing control module of system.Domestic liquid level gauge Calibration Technology generally uses law of connected vessels at present, bulky, is only capable of in reality
Room is tested to be examined and determine, and the equal volume of all kinds of liquid level gauges is larger not readily transportable, and easily influenceed to receive by logistics in transportation
Damage.Therefore, develop a kind of calibrating efficiency is high, practical field level liquid level gauge detection means and corresponding method of detection seems
It is particularly important.
The mechanism of domestic detection liquid level gauge is mainly each province, gauge check research institute of city and other gauge check machines at present
Structure.Law of connected vessels typically is utilized, liquid level gauge is detected by the way of water tank and analogy method combine, the peace of liquid level gauge
Dress and measurement use manual type, and measurement is usually ruler with standard, need to be directed to different liquid level gauges customization stationary fixture.Pass
The method of system has several defects：(1) traditional detection method device is huge, test in laboratory is simply possible to use in, for liquid level gauge
For censorship, efficiency is low, and the transport for liquid level gauge has higher requirements.(2) traditional detection method is often due to liquid level
Meter is inserted perpendicularly into calibrating water tank, and the detection of liquid level gauge is needed for different types of liquid level gauge customization stationary fixture, this
Individual process is time-consuming longer, has a strong impact on detection efficiency.(3) traditional detection method installation and measurement (including each measurement point
Water level control) manual type is used, measurement is usually ruler with standard, and artificial error in reading is bigger than normal.(4) traditional detection
Detection is required to expend nearly hectolitre pure water method every time, less economical.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming above-mentioned prior art, there is provided one kind is applied to each DC converter station liquid level gauge
Site Detection, it can be convenient for carrying, realize high-acruracy survey, be analog detection, small by such environmental effects and possess and automatically control
Measure the liquid level gauge filed detection system and method for function.
The present invention is achieved through the following technical solutions：
A kind of liquid level gauge filed detection system of high voltage direct current converter valve cooling system, including platform support, transmitter base
Seat, ball float pedestal, stepper motor, straight-line displacement mechanism, control module, computer module, straight steel ruler, laser range finder；It is described
Transmitter pedestal be used to gripping the transmitter head of liquid level gauge, described ball float pedestal is used to gripping liquid level gauge and floated
Ball, described transmitter pedestal, ball float pedestal are separately positioned on straight-line displacement mechanism, and described stepper motor drives straight line position
Telephone-moving structure makes ball float pedestal be moved along a straight line back and forth with respect to the realization of transmitter pedestal, measurement direction, the Laser Measuring of described straight steel ruler
The direction of motion of the directions of rays of distance meter and straight-line displacement mechanism is parallel to each other in same level, and straight steel ruler and laser ranging
The dead-center position of instrument should with transmitter base position relation pair；Described ball float pedestal is provided with the indicator perpendicular to straight steel ruler
Head and vertical and keep out the baffle plate of the ray of laser range finder, described arrow moves with baffle plate with ball float base；Described
Control module is used for the electric signal for controlling stepper motor, the transmitter head on reception transmitter pedestal and laser range finder, described
Computer module be used for the output signal of processing and control module, it is described transmitter pedestal, ball float pedestal, stepper motor, straight
Displacement of the lines mechanism is arranged on platform support.
As the improvement of such scheme, described straight-line displacement mechanism includes line slideway, driving belt, guide rail slide block；
Described transmitter pedestal is arranged on one end of line slideway, and guide rail slide block is arranged on line slideway and slided, described ball float
Pedestal is arranged on guide rail slide block, and described driving belt is set in parallel in line slideway periphery and the covering full row of line slideway
Journey, the dynamic point connection on described guide rail slide block and driving belt, described driving belt pass through described stepper motor band
It is dynamic.
As the improvement of such scheme, described straight steel ruler, laser range finder, level is equipped with straight-line displacement mechanism
Instrument.
A kind of liquid level gauge in-situ check and test method of high voltage direct current converter valve cooling system, is comprised the following steps that：
Step 1. carries out installation fixation to liquid level gauge, and carries out horizontal adjustment.
It is adjustable that step 2. such as liquid level is calculated as set point, then carries out step 10, the setting test point quantity as not being if, including upper
Point of accumulation, lower-limit point and test point are no less than 5 points inside.
Step 3. equipment initializes, and equipment belt moves liquid level gauge and determines full scale and dead-center position, while is moved to each detection
Point position.
Step 4. carries out energization preheating to the liquid level gauge powered with power supply.
The measurement of each test point indicating value of step 5., with " alignment is tested to see standard " method during detection, it is detected liquid level gauge and is opened from zero-bit
Each test point is gradually arrived in the measurement of beginning up stroke, until the upper limit.Then start down stroke and gradually arrive each test point, until lower limit.Phase
Between, the indicating value of each test point is measured with laser range finder, and upload the data to control module.
Step 6. circulation step 5 is three times.
The calculating of step 7. error of indication rounds indicating value of the error of indication maximum as the liquid level gauge in a measurement process
Error.The error of indication of each test point is calculated by formula (1), (2)：
Δ1=Hd-Hw1 (1)
Δ2=Hd-Hw2 (2)
In formula：
Δ1, Δ2, the error of indication of the respectively tested upper and lower stroke of liquid level gauge.
Hw1, Hw2, the indicating value of standard liquid level gauge respectively corresponding to the upper and lower stroke indicating value of tested liquid level gauge.
Hd, the indicating value of tested liquid level gauge.
Step:8：The calculating of return difference.Return difference is calculated by formula (3), and the return difference of liquid level gauge should be no more than the maximum allowable mistake of indicating value
The absolute value of difference.
Δ H=| Hw1-Hw2| (3)
In formula：
Hw1, Hw2, (repeatedly measurement then takes Δ H's to standard liquid level indicating value during the same liquid level indicating value of respectively upper and lower stroke
Maximum).
The calculating of step 9. liquid level output signal error, control module are reading the indicating value H of standard liquid level gaugew1And Hw2's
Meanwhile while also read the output current value I of tested liquid level gauge1And I2, output error is calculated by formula (4):
In formula：
The respectively output error of the upper and lower stroke of liquid level gauge.
I1, I2, the respectively output current value of the upper and lower stroke of liquid level gauge.
Im, the pick-up output range of liquid level gauge.
Hm, the range (i.e. FS) of liquid level gauge.
I0, the pick-up output initial value of liquid level gauge.
The calculating of step 10. set point error and differential gap.For the adjustable liquid level gauge of set point, should be selected in step 2
It is that control module will control to measure on set point near the 10% of liquid level gauge range, 50%, 90%.Opened from zero-bit
Begin gradually to start up stroke, in the output state change close to set point liquid level gauge, before measurement module changes recording status
Measured value Hsw1 (upper switching value).Then down stroke is slowly carried out, when output state changes again, recording status changes again
Measured value Hsw2 (lower switching value) before change.System can carry out the detection of three circulations automatically.Round error in a measurement process
The maximum set point error as the liquid level gauge.Set point error calculates according to formula (5), and differential gap calculates according to formula (6).
Δsw=[(Hsw1+Hsw2)/2]-Hsp (5)
Δsd=| Hsw1-Hsw2| (6)
In formula：
Δsw, the set point error of liquid level gauge.
Hsw1, Hsw2, (or three circulations is flat for the Water in Water Tank place value read when respectively upper and lower stroke output state changes
Average).
Hsp, set point level value.
Step 11. data processing, computer module count to the measurement structure and calculating structure of step 4 to step 10
By logic judgment, probation redport is automatically formed.
The invention has the advantages that：
1st, servo-control system control measurement point.By the accurate closed-loop control of servo-drive system, can more accurately by
Ball float is moved to each measurement point, avoids because the problem of manual operation or Mechanical course water level can not be accurately positioned measurement point.
2nd, measurement function is optimized.Traditional calibrating be manually in straight steel ruler reading by way of carry out, this hair
The application of laser ranging in bright, artificial reading can be replaced, reduce error in reading, while can also greatly improve efficiency.
3rd, data record and error calculation are completed by computing module.Traditional detection needs hand-kept largely to detect data, phase
Than for, the present invention has the lifting of matter to improving calibrating efficiency.
4th, the liquid level meter detecting device that this patent is invented can realize automatic calibration process, and the calibrating time shortens 3/
4, the degree of accuracy improves 1 times.Meanwhile compared with the existing device in the country, the device has relatively low cost, convenience in transport, suitable for existing
Field, wide adaptability, it is with strong points, automaticity is high the advantages that, there is preferable promotional value.
Brief description of the drawings
Fig. 1 is the structural representation of the detecting system of embodiment 1.
Fig. 2 is the positive structure schematic of the detecting system of embodiment 1.
Fig. 3 is the non-adjustable error calculation logic chart of detection method liquid level gauge set point of embodiment 2.
Fig. 4 is the detection method liquid level gauge set point Adjustable Error calculating logic figure of embodiment 2.
Embodiment
Embodiment 1
As shown in Figure 1 and Figure 2, a kind of liquid level gauge filed detection system of high voltage direct current converter valve cooling system, including platform
Support 1, transmitter pedestal 2, ball float pedestal 3, stepper motor 4, straight-line displacement mechanism 5, control module 6, computer module 7, steel
Ruler 8, laser range finder 9；Transmitter that described transmitter pedestal 2 is used to grip liquid level gauge is first 10, described ball float
Pedestal 3 is used to grip liquid level gauge ball float 11, and described transmitter pedestal 2, ball float pedestal 3 are separately positioned on straight-line displacement machine
Structure 5, described stepper motor 4 drives straight-line displacement mechanism 5 ball float pedestal 3 is realized straight line back and forth with respect to transmitter pedestal 2
Motion, the measurement direction of described straight steel ruler 8, the direction of motion of the directions of rays of laser range finder 9 and straight-line displacement mechanism 5 exist
Same level is parallel to each other, and straight steel ruler 8 is corresponding with the position relationship of transmitter pedestal 2 with the dead-center position of laser range finder 9；
Described ball float pedestal 3 is provided with arrow 12 and ray that is vertical and keeping out laser range finder 9 perpendicular to straight steel ruler 8
Baffle plate 13, described arrow 12 move with baffle plate 13 with ball float base；Described control module 6 be used for control stepper motor 4,
The electric signal of the transmitter first 10 and laser range finder 9 on transmitter pedestal 2 is received, described computer module 7 is used to handle
The output signal of control module 6, described transmitter pedestal 2, ball float pedestal 3, stepper motor 4, straight-line displacement mechanism 5 are respectively provided with
On platform support 1.Described straight-line displacement mechanism 5 includes line slideway 14, driving belt 15, guide rail slide block 16；Described
Transmitter pedestal 2 is arranged on one end of line slideway 14, and guide rail slide block 16 is arranged on line slideway 14 and slided, described ball float
Pedestal 3 is arranged on guide rail slide block 16, and described driving belt 15 is set in parallel in the periphery of line slideway 14 and covering straight line is led
The total travel of rail 14, described guide rail slide block 16 are connected with the dynamic point on driving belt 15, and described driving belt 15 passes through institute
The stepper motor 4 stated drives.Described straight steel ruler 8, laser range finder 9, level meter 17 is equipped with straight-line displacement mechanism 5.
Embodiment 2
A kind of liquid level gauge in-situ check and test method of high voltage direct current converter valve cooling system, is comprised the following steps that：
Step 1. carries out installation fixation to liquid level gauge, and carries out horizontal adjustment；
It is adjustable that step 2. such as liquid level is calculated as set point, then carries out step 10, the setting test point quantity as not being if, including upper
Point of accumulation, lower-limit point and test point are no less than 5 points inside；
Step 3. equipment initializes, and equipment belt moves liquid level gauge and determines full scale and dead-center position, while is moved to each detection
Point position；
Step 4. carries out energization preheating to the liquid level gauge powered with power supply；
The measurement of each test point indicating value of step 5., with " alignment is tested to see standard " method during detection, it is detected liquid level gauge and is opened from zero-bit
Each test point is gradually arrived in the measurement of beginning up stroke, until the upper limit；Then start down stroke and gradually arrive each test point, until lower limit；Phase
Between, the indicating value of each test point is measured with laser range finder, and upload the data to control module；
Step 6. circulation step 5 is three times；
The calculating of step 7. error of indication rounds indicating value of the error of indication maximum as the liquid level gauge in a measurement process
Error；Calculating logic is shown in Fig. 3.The error of indication of each test point is calculated by formula (1), (2)：
Δ1=Hd-Hw1 (1)
Δ2=Hd-Hw2(2) in formula：
Δ1, Δ2, the error of indication of the respectively tested upper and lower stroke of liquid level gauge；
Hw1, Hw2, the indicating value of standard liquid level gauge respectively corresponding to the upper and lower stroke indicating value of tested liquid level gauge；
Hd, the indicating value of tested liquid level gauge；
Step:8：The calculating of return difference；Return difference is calculated by formula (3), and calculating logic is shown in Fig. 3.The return difference of liquid level gauge should be no more than
The absolute value of the indicating value limits of error；
Δ H=| Hw1-Hw2| (3)
In formula：
Hw1, Hw2, (repeatedly measurement then takes Δ H's to standard liquid level indicating value during the same liquid level indicating value of respectively upper and lower stroke
Maximum)；
The calculating of step 9. liquid level output signal error, calculating logic are shown in Fig. 3.Control module is reading standard liquid level gauge
Indicating value Hw1And Hw2While, while also read the output current value I of tested liquid level gauge1And I2, calculate output by formula (4) and miss
Difference:
In formula：
The respectively output error of the upper and lower stroke of liquid level gauge；
I1, I2, the respectively output current value of the upper and lower stroke of liquid level gauge；
Im, the pick-up output range of liquid level gauge；
Hm, the range (i.e. FS) of liquid level gauge；
I0, the pick-up output initial value of liquid level gauge；
The calculating of step 10. set point error and differential gap；For the adjustable liquid level gauge of set point, should be selected in step 2
It is that control module will control to measure on set point near the 10% of liquid level gauge range, 50%, 90%；Opened from zero-bit
Begin gradually to start up stroke, in the output state change close to set point liquid level gauge, before measurement module changes recording status
Measured value Hsw1 (upper switching value)；Then down stroke is slowly carried out, when output state changes again, recording status changes again
Measured value Hsw2 (lower switching value) before change.System can carry out the detection of three circulations automatically；Round error in a measurement process
The maximum set point error as the liquid level gauge；Calculating logic is shown in Fig. 4.Set point error is calculated according to formula (5), and differential gap is pressed
Illuminated (6) calculates；
Δsw=[(Hsw1+Hsw2)/2]-Hsp (5)
Δsd=| Hsw1-Hsw2| (6)
In formula：
Δsw, the set point error of liquid level gauge；
Hsw1, Hsw2, (or three circulations is flat for the Water in Water Tank place value read when respectively upper and lower stroke output state changes
Average)；
Hsp, set point level value；
Step 11. data processing, computer module count to the measurement structure and calculating structure of step 4 to step 10
By logic judgment, probation redport is automatically formed.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and the embodiment simultaneously is not used to limit this hair
Bright the scope of the claims, all equivalence enforcements or change without departing from carried out by the present invention, it is intended to be limited solely by the scope of the claims of this case.
Claims (4)
- A kind of 1. liquid level gauge filed detection system of high voltage direct current converter valve cooling system, it is characterised in that including platform support, Transmitter pedestal, ball float pedestal, stepper motor, straight-line displacement mechanism, control module, computer module, straight steel ruler, laser ranging Instrument；Described transmitter pedestal is used to grip the transmitter head of liquid level gauge, described ball float pedestal for gripping liquid Position meter ball float, described transmitter pedestal, ball float pedestal are separately positioned on straight-line displacement mechanism, and described stepper motor drives Straight-line displacement mechanism makes ball float pedestal be moved along a straight line back and forth with respect to the realization of transmitter pedestal, the measurement direction of described straight steel ruler, The direction of motion of the directions of rays of laser range finder and straight-line displacement mechanism is parallel to each other in same level, and straight steel ruler is with swashing The dead-center position of optar should with transmitter base position relation pair；Described ball float pedestal is provided with perpendicular to straight steel ruler Arrow and vertical and keep out the baffle plate of the ray of laser range finder, described arrow moves with baffle plate with ball float base； Described control module is used for the telecommunications for controlling stepper motor, the transmitter head on reception transmitter pedestal and laser range finder Number, described computer module is used for the output signal of processing and control module, described transmitter pedestal, ball float pedestal, stepping Motor, straight-line displacement mechanism are arranged on platform support.
- 2. a kind of liquid level gauge filed detection system of high voltage direct current converter valve cooling system according to claim 1, it is special Sign is that described straight-line displacement mechanism includes line slideway, driving belt, guide rail slide block；Described transmitter pedestal is set In one end of line slideway, guide rail slide block is arranged on line slideway and slided, and described ball float pedestal is arranged on guide rail slide block, Described driving belt is set in parallel in line slideway periphery and covering line slideway total travel, described guide rail slide block and transmission Dynamic point connection on belt, described driving belt are driven by described stepper motor.
- 3. a kind of liquid level gauge filed detection system of high voltage direct current converter valve cooling system according to claim 1, it is special Sign is, described straight steel ruler, laser range finder, is equipped with level meter in straight-line displacement mechanism.
- 4. a kind of liquid level gauge in-situ check and test method of high voltage direct current converter valve cooling system, it is characterised in that comprise the following steps that：Step 1. carries out installation fixation to liquid level gauge, and carries out horizontal adjustment；It is adjustable that step 2. such as liquid level is calculated as set point, then carries out step 10, the setting test point quantity as not being if, including the upper limit Point, lower-limit point and test point are no less than 5 points inside；Step 3. equipment initializes, and equipment belt moves liquid level gauge and determines full scale and dead-center position, while is moved to each test point position Put；Step 4. carries out energization preheating to the liquid level gauge powered with power supply；The measurement of each test point indicating value of step 5., with " alignment is tested to see standard " method during detection, tested liquid level gauge since zero-bit on Stroke measurment gradually arrives each test point, until the upper limit；Then start down stroke and gradually arrive each test point, until lower limit；Period, use Laser range finder measures the indicating value of each test point, and upload the data to control module；Step 6. circulation step 5 is three times；The calculating of step 7. error of indication rounds the error of indication of the error of indication maximum as the liquid level gauge in a measurement process； The error of indication of each test point is calculated by formula (1), (2)：Δ1=Hd-Hw1 (1)Δ2=Hd-Hw2 (2)In formula：Δ1, Δ2, the error of indication of the respectively tested upper and lower stroke of liquid level gauge；Hw1, Hw2, the indicating value of standard liquid level gauge respectively corresponding to the upper and lower stroke indicating value of tested liquid level gauge；Hd, the indicating value of tested liquid level gauge；Step:8：The calculating of return difference；Return difference is calculated by formula (3), and the return difference of liquid level gauge should be no more than the indicating value limits of error Absolute value；Δ H=| Hw1-Hw2| (3)In formula：Hw1, Hw2, (repeatedly measurement then takes Δ H maximum to standard liquid level indicating value during the same liquid level indicating value of respectively upper and lower stroke Value)；The calculating of step 9. liquid level output signal error, control module are reading the indicating value H of standard liquid level gaugew1And Hw2While, The output current value I of tested liquid level gauge is also read simultaneously1And I2, output error is calculated by formula (4):<mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&Delta;</mi> <msub> <mi>I</mi> <mn>1</mn> </msub> </msub> <mo>=</mo> <msub> <mi>I</mi> <mn>1</mn> </msub> <mo>-</mo> <mrow> <mo>(</mo> <mfrac> <msub> <mi>I</mi> <mi>m</mi> </msub> <msub> <mi>H</mi> <mi>m</mi> </msub> </mfrac> <mo>&CenterDot;</mo> <msub> <mi>H</mi> <mrow> <mi>w</mi> <mn>1</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>I</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&Delta;</mi> <msub> <mi>I</mi> <mn>2</mn> </msub> </msub> <mo>=</mo> <msub> <mi>I</mi> <mn>2</mn> </msub> <mo>-</mo> <mrow> <mo>(</mo> <mfrac> <msub> <mi>I</mi> <mi>m</mi> </msub> <msub> <mi>H</mi> <mi>m</mi> </msub> </mfrac> <mo>&CenterDot;</mo> <msub> <mi>H</mi> <mrow> <mi>w</mi> <mn>2</mn> </mrow> </msub> <mo>+</mo> <msub> <mi>I</mi> <mn>0</mn> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>In formula：The respectively output error of the upper and lower stroke of liquid level gauge；I1, I2, the respectively output current value of the upper and lower stroke of liquid level gauge；Im, the pick-up output range of liquid level gauge；Hm, the range (i.e. FS) of liquid level gauge；I0, the pick-up output initial value of liquid level gauge；The calculating of step 10. set point error and differential gap；For the adjustable liquid level gauge of set point, should select to be to control in step 2 Molding block will control to be measured on set point near the 10% of liquid level gauge range, 50%, 90%；Since zero-bit gradually Start up stroke, close to set point liquid level gauge output state change when, measurement module recording status is changed before measurement Value Hsw1 (upper switching value)；Then down stroke is slowly carried out, when output state changes again, before recording status changes again Measured value Hsw2 (lower switching value).System can carry out the detection of three circulations automatically；Round error maximum in a measurement process Set point error as the liquid level gauge；Set point error calculates according to formula (5), and differential gap calculates according to formula (6)；Δsw=[(Hsw1+Hsw2)/2]‐Hsp (5)Δsd=| Hsw1-Hsw2| (6)In formula：Δsw, the set point error of liquid level gauge；Hsw1, Hsw2, (or three circulations are averaged the Water in Water Tank place value read when respectively upper and lower stroke output state changes Value)；Hsp, set point level value；Step 11. data processing, computer module carry out statistics and passed through to the measurement structure and calculating structure of step 4 to step 10 Logic judgment, automatically form probation redport.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116519101A (en) * | 2023-01-13 | 2023-08-01 | 潍坊亚峰化工仪表有限公司 | Automatic detection, calibration and correction system for wide-range liquid level meter |
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